Vibrator for concrete mixers



July 13, 1948. A. F. SCHUNK 2,445,126

VIBRATOR FOR CONCRETE MIXERS Filed Sept. 3, 1947 Inventor Ant/zany Schun/r Patented July 13, 1948 UNITED STATES PATENT OFFICE VIBRATOR FOR CONCRETE MIXERS Anthony F. Schunk, Alden, N. Y.

Application September 3, 1947, Serial No. 771,899

1 Claim. 1

This invention relates to concrete mixers and more particularly to that type of mixer which comprise a rotary drum adapted to be charged with aggregates by means of a pivoted skip and has for its primary object to vibrate the skip when the latter is in load-discharging position, thereby to assist in the movement of the aggregates from the skip into the drum.

Another object is automatically to strike the skip a blow as it reaches load-discharging position to loosen the aggregate and facilitate its movement toward the discharge end of the skip.

The above and other objects may be attained by employing this invention, which embodies among its features means carried by the charging skip of a concrete mixer and operable when the latter is moved into load-discharging position to vibrate the skip and facilitate the discharge of materials therefrom.

Other features include a bracket secured to the bottom of the skip and a hammer pivoted to the bracket to swing about an axis which lies parallel to the axis about which the skip moves to strike the bottom of the skip when the latter reaches its discharge position and vibrate the skip tocause the material contained therein to be discharged therefrom.

In the drawings,

Figure 1 is an end view of a concrete mixer equipped with a conventional loading skip upon which this vibrator i mounted,

Figure 2 is a plan view of the hammer used for vibrating the skip, and

Figure 3 is a fragmentary sectional view taken substantially along the line 3-3 of Figure 2.

Referring to the drawings in detail, a concrete mixer designated generally It is equipped with a conventional rotatable mixing drum ll adjacent one end of which is pivotally supported the discharge end l2 of a skip designated generally [3. The skip I3 is provided at the end remote from the discharge end with the loading end [4 to which my improved vibrating attachment, designated generally I5, is connected.

The vibrating attachment above referred to comprises a base plate It which is adapted to be welded or otherwise rigidly fixed to the bottom of the skip adjacent its loading end [4, and welded or otherwise attached to the base plate [6 is a pair of angle bars I! between the outstanding flanges of which is pivoted, as at l8, one end of a rocking arm l9. Riveted or otherwise attached, as at 20, to the end of the rocking arm I9 remote from the pivoted end is a hammer head, designated generally 2|, which comprises a flat plate 22 to which is welded a face plate 23 which is disposed toward the bottom of the skip, as illustrated in Figure 1, so that as the skip swings upwardly to discharge its load into the drum II, the face plate 23 of the hammer 2| will swing against the bottom of the skip to jar the contents loose and cause it to be discharged into the drum ll through the discharge end 12.

In use, it will be understood that the base plate It is welded or otherwise fixed to the bottom of the skip adjacent its loading end M, as illustrated in Figure 1, and when the skip is in lowered position, the hammer head 2! will rest on the bottom of the skip. As the skip I3 is elevated to discharge its, load into the drum H and comes to rest in its upper position, it is evident that the momentum of the hammer head 2| will cause the latter to swing away from the skip and then rebound forcibly to strike the bottom of the skip to jar the contents loose. It is obvious that the vibration imparted to the skip ['3 will cause the material deposited therein to be discharged through the discharge end I 2 and into the mixing drum ll, thus avoiding the necessity of striking the bottom of the skip with sledge hammers or shovels, and rendering the vibration of the skip wholly automatic.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

Having described the claimed as new is:

In a concrete mixer, a rotatable mixing drum, a charging skip pivoted to move about a horizontal axis from a load-receiving position to a load-discharging position adjacent said drum, a bracket carried by the bottom of the skip and a hammer pivoted to the bracket to swing about an axis which lies parallel to the axis about which the skip moves and strike the bottom of the skip when the latter reaches its discharge position to facilitate the discharge of material from the skip.

ANTHONY F. SCHUNK.

invention, what is REFERENCES CITED UNITED STATES PATENTS Name Date Lichtenberg Mar, 14, 1944 Number 

